CN115262093B - Directional elastic nonwoven material, preparation method and elastic product - Google Patents
Directional elastic nonwoven material, preparation method and elastic product Download PDFInfo
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- CN115262093B CN115262093B CN202211168930.9A CN202211168930A CN115262093B CN 115262093 B CN115262093 B CN 115262093B CN 202211168930 A CN202211168930 A CN 202211168930A CN 115262093 B CN115262093 B CN 115262093B
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
- D04H5/02—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00089—Wound bandages
- A61F2013/00119—Wound bandages elastic
Abstract
The scheme discloses a directional elastic nonwoven material, a preparation method and an elastic product, wherein the preparation method comprises the steps of preparing an elastic filament cool feeling fiber layer, preparing raw materials comprising a polypropylene polymer and a functional polymer, and adopting a spunbond process to prepare the directional elastic nonwoven material; the method comprises the steps of manufacturing a short fiber skin softening layer, and preparing polyester fibers and cellulose fibers into the short fiber skin softening layer through a carding process; the elastic filament cool feeling fiber layer and the short fiber soft skin layer are made into a multi-layer superposed fiber net through cross lapping; and finally, needling and solidifying. The directional elastic nonwoven material prepared by the scheme is an integrated structure with flexibility, elasticity and cool feeling, can meet the technical requirements of application in the fields of medical bandages, medical auxiliary materials and the like, achieves the purposes of promoting wound healing and treatment through the soft, skin-friendly and breathable characteristics, has a wider application range and is easy to use.
Description
Technical Field
The scheme relates to the field of non-woven materials, in particular to an oriented elastic non-woven material, a preparation method and an elastic product.
Background
In recent years, with the improvement of living standard, protection consciousness and protection requirements of people, the development of nonwoven materials is vigorous. While the yield and demand are rapidly increasing, there is a growing demand for product comfort and functionality, particularly in the areas of personal hygiene (child toddler training pants, baby diapers, etc.), and medical care (medical bandages, cushioning pads, packaging, etc.), among others.
Therefore, how to improve the elasticity, comfort, fit and flexibility of the product while maintaining the basic properties of the nonwoven material is a common focus of attention in the nonwoven material field and the functional care field.
The elastic nonwoven material generally refers to a nonwoven material with an elongation of more than 60% under the action of external force, and an elongation recovery of more than 55% after the external force is eliminated; there are three existing methods for making elastic nonwoven materials:
the first method is to directly obtain an elastic nonwoven material with a single structure by using elastic polymers such as polyolefin elastomer, polyurethane and styrene segmented copolymer through nonwoven technologies such as spunbonding, melt blowing and the like;
the second is to use a compounding process to compound the elastic material (such as nonwoven material, film, knitted fabric, etc.) with the inelastic material by physical, thermal fusion or chemical bonding, so as to obtain an elastic nonwoven material with a vertically laminated structure;
the third is to impregnate the inner layer of the nonwoven material with the polyurethane polymer solution using the film forming principle and to consolidate the same in the form of a film, thus forming a uniform structure of film and fiber. The process described above can be used to obtain elastic nonwoven materials.
For example, patent No. 201710403938.1, entitled a method for producing a nonwoven fabric with unidirectional elasticity, in which an elastomer material is directly melted and sprayed onto a common spunbond nonwoven fabric by a spunbond nozzle, and then pressed by a rolling mill, thereby eliminating the process of sandwiching a pleated elastic film between two layers of spunbond nonwoven fabrics by conventional process techniques.
The above proposal has the disadvantages of comfort and parcel deviation for the application of the bandage in specific fields.
Based on the above, a novel oriented elastic nonwoven material and a preparation method thereof are sought, and the flexibility, the cool feeling and the functionality of the oriented elastic nonwoven material are enhanced, so that the oriented elastic nonwoven material becomes a common research hotspot in a plurality of fields such as medical care, personal hygiene and the like.
Disclosure of Invention
The scheme provides a preparation method of the directional elastic non-woven material for solving the problems.
The technical means adopted by the scheme is as follows: the preparation method of the directional elastic nonwoven material comprises the steps of preparing an elastic filament cool sense fiber layer, wherein the preparation raw materials comprise polypropylene polymer and functional polymer, and the preparation method adopts a spunbond process;
the method comprises the steps of manufacturing a short fiber skin softening layer, and preparing polyester fibers and cellulose fibers into the short fiber skin softening layer through a carding process;
the elastic filament cool feeling fiber layer and the short fiber soft skin layer are made into a multi-layer superposed fiber net through cross lapping;
needling and consolidation.
In the method, the preparation raw materials comprise the following components in percentage by mass:
PP：15.5%-50.5%；
EVOH：3%-10%；
POE：45%-70%；
paraffin oil: 1.5% -4.5%;
the melt index of the EVOH is 12-35g/10min (210 ℃,2.16 kg), the weight average molecular weight of the PP is 18000-35000, and the melt index is 35-60g/10min (210 ℃,2.16 kg).
In the method, the short fiber skin softening layer comprises the following components:
mixing according to the mass ratio:
10% -50% of cellulose fiber;
50% -90% of polyester fiber;
the cellulose fiber is viscose fiber.
In the method, the fiber ratio of the elastic filament cool feeling fiber layer with the included angle of the fiber length direction and the machine direction being less than 15 degrees is more than 85 percent; the fiber ratio of the short fiber skin softening layer is more than 90% and the included angle between the fiber length direction and the machine direction is less than 25 degrees.
In the method, in the step of manufacturing the composite layer, the elastic filament cool feeling fiber layer and the short fiber softening layer are stacked up and down, and the stacked layers are sent into a lapping machine to be lapped in an overlapping manner to form a multi-layer overlapped fiber net, wherein the number of lapping layers is 2-5.
In the method, in the needling consolidation step, the multi-layer laminated fiber web is repeatedly punctured by adopting a needling process, and the needling density is 180-330Thorn/cm 2 The needling depth is 4-12mm.
The directional elastic nonwoven material manufactured based on the method is characterized in that:
the elastic filament cool feeling fiber layer with the mass ratio of 50-75% and the short fiber softening layer with the mass ratio of 25-50% are overlapped and combined, and are needled and solidified, and the oriented elastic non-woven material has oriented elasticity, and the oriented direction is any direction with the included angle of 25-75 degrees with the machine.
In the present directionally elastic nonwoven, the elastic recovery of the directional elasticity is 30% to 70%.
In the present oriented elastic nonwoven material, the areal density is from 100 to 550g/m 2 The thickness is 0.6-2.5mm, the porosity is 90% -99.5%, and the contact cool feeling coefficient is 0.170-0.450J/cm.
In the oriented elastic nonwoven material, the fiber fineness of the elastic filament cool feeling fiber layer is 1.6-2.2D of polyolefin elastic fiber;
the short fiber skin softening layer comprises 30-100% of cellulose fibers and 0-70% of polyester fibers in mass ratio; the fineness of the cellulose fiber is 0.99-1.51dtex, and the length of the cellulose fiber is 38-61mm; the fiber fineness of the polyester fiber is 2.2-5.6dtex, and the fiber length is 38-61mm.
In the oriented elastic nonwoven material, the transverse breaking strength is more than 79N, and the transverse breaking elongation is more than 124 percent; the longitudinal breaking strength is more than 157N, and the longitudinal breaking elongation is more than 74%; burst strength > 214N; the flexibility score is more than or equal to 92.
The scheme also provides an elastic product based on the oriented elastic nonwoven material, such as a skin-friendly elastic nonwoven bandage, which is made of the oriented elastic nonwoven material.
In summary, the scheme has the following advantages:
the directional elastic nonwoven material provided by the scheme has the advantages of softness, ventilation, moisture permeability, good liquid absorption rate, high elasticity, directional elasticity, comfort and the like.
The use of a directional elasticity nonwoven material that this scheme provided, POE and EVOH raw materials increases the cool sense in the while that improves material elasticity.
The directional elastic nonwoven material provided by the scheme adopts the needling reinforcement technology to replace the use of the adhesive, so that the material strength is improved, the environment friendliness is improved, the wound infection risk is reduced and the comfort of a user is improved when the directional elastic nonwoven material is applied to bandages, and the directional elastic nonwoven material is a product which is required by medical bandages in the future in market.
Drawings
FIG. 1 is a schematic cross-sectional view of an oriented elastic nonwoven material of the present invention;
FIG. 2 is a table of process parameters and product performance test results for the preparation of the examples of the present invention;
FIG. 3 is a schematic illustration of a spunbond process;
FIG. 4 is a schematic illustration of a fiber comb;
FIG. 5 is a schematic illustration of a needlepunching composite;
FIG. 6 is an electron microscopy image of a cool feeling fiber layer of elastic filaments;
FIG. 7 is a schematic cross-sectional view of a layer of elastic filament cool feeling fibers;
FIG. 8 is a schematic cross-sectional view of a composite layer;
FIG. 9 is a fiber orientation distribution angle of spunbond fibers;
FIG. 10 is a graph of composite layer fiber orientation distribution angle;
FIG. 11 is a graph of density comparison before and after needling;
FIG. 12 is a schematic diagram of MD elasticity;
FIG. 13 is a schematic diagram of CD elasticity;
FIG. 14 is an elastic recovery result;
FIG. 15 is a longitudinal stretch-break curve;
FIG. 16 is a graph showing the results of machine direction tensile break strength and slip strength;
FIG. 17 is a graph showing the elongation at break results in the machine direction;
FIG. 18 is a transverse stretch-break curve;
FIG. 19 is a graph showing the results of transverse tensile breaking strength and slip strength;
FIG. 20 is a graph showing elongation at break results in the cross direction;
FIG. 21 is thickness and porosity results;
FIG. 22 is a softness test score;
FIG. 23 is a cooling sensation test result;
FIG. 24 is a schematic of a bandaging application;
FIG. 25 shows a packaged gesture variation one;
FIG. 26 is a packaged second gesture variation;
fig. 27 shows a packaged gesture change three.
Detailed Description
The invention is further described in the following description with reference to specific illustrations and embodiments in order to make the technical means, the creation characteristics, the achievement of the objects and the effects of the invention easy to understand.
Example 1:
the embodiment provides an application of an oriented elastic nonwoven material in manufacturing a skin-friendly elastic nonwoven bandage, which comprises the following specific manufacturing steps:
s1, manufacturing an elastic filament cool feeling fiber layer
The polypropylene polymer and the functional polymer are used as raw materials, and the elastic filament cool feeling fiber layer is prepared by adopting a spunbond process.
In this step, the preparation raw materials include blending in mass ratio:
PP：15.5%-50.5%；
EVOH：3%-10%；
POE：45%-70%；
paraffin oil: 1.5% -4.5%;
the melt index of the EVOH (ethylene-vinyl alcohol copolymer) is 12-35g/10min (210 ℃,2.16 kg), the weight average molecular weight of the PP (polypropylene) is 18000-35000, and the melt index is 35-60g/10min (210 ℃,2.16 kg); the POE is a polyethylene octene copolymer.
And POE is a thermoplastic polymer, and meanwhile, the polyethylene octene copolymer (POE) has very narrow relative molecular mass distribution and short branched chains.
The EVOH raw material gives the product a cool feel.
Finally, the polyolefin elastic fiber with the fiber fineness of 1.6-2.2D is prepared, and the fiber ratio of the included angle between the fiber length direction of the elastic filament cool feeling fiber layer and the machine direction is less than 15 degrees and is more than 85 percent.
Different elastic filament cool feeling fiber layers (elastic spunbonded nonwoven materials) were produced, the surface densities were 45g/m, 55g/m, 60g/m and 120g/m respectively, data comparison was made at a later stage, and the effect of properties was studied.
In this example, an areal density of 45g/m was selected.
Referring to fig. 3, a schematic diagram of a spunbond process is shown, specifically, the spunbond nonwoven material is formed by extruding (extruder), pumping (pump die) and stretching (drawing) after blending raw materials, and the spunbond process is a mature process known to those skilled in the art and will not be described in detail herein.
An electron microscopic image of the obtained spun-bonded non-woven material is shown in fig. 6, and a cross section of the spun-bonded non-woven material is shown in fig. 7.
S2, preparation of short fiber skin softening layer
Polyester fiber and cellulose fiber are prepared into a short fiber skin softening layer through a carding process.
Specifically, referring to fig. 4, to provide a schematic view of a carded web, VIS (viscose-cellulose fibers) and PET (polyester fibers) are blended (Blending) and then carded to obtain a staple fiber skin softening layer.
Wherein the short fiber skin softening layer comprises 30-100% of cellulose fiber and 0-70% of polyester fiber in mass ratio.
The concrete components are mixed according to the mass ratio:
10% -50% of cellulose fiber;
50% -90% of polyester fiber;
the cellulose fiber is viscose fiber.
The blending ratio of the viscose fiber to the polyester fiber can be set to be in gradient change, namely 10:90, 20:80, 30:70, 40:60 and 50:50; the influence of the content change of the viscose fiber and the polyester fiber on the material performance is studied by taking the content change as a variable.
In this embodiment, a mixing ratio of 50:50 is selected.
The fineness of the cellulose fiber is 0.99-1.51dtex, and the length of the cellulose fiber is 38-61mm; the fiber fineness of the polyester fiber is 2.2-5.6dtex, and the fiber length is 38-61mm.
The cellulose fiber and the polyester fiber are evenly fed into an opener, then enter a transition cotton box through a cotton feeder, and then enter a carding machine for carding to obtain a fiber web, wherein the adopted carding equipment is a cylinder-roller type carding machine.
The technological parameters of the carding machine are set as follows: tin Lin Zhuaisu Hz, doffer rotation speed 12Hz and feeding speed 6Hz.
And the fiber ratio of the included angle between the fiber length direction of the short fiber skin softening layer and the machine direction is less than 25 degrees and is more than 90 percent.
S3, manufacturing of composite layer
The elastic filament cool feeling fiber layer and the short fiber softening layer are crossly laid to form a multi-layer superposed fiber net.
Combining the carded web of step S2 with a areal density of 45g/m 2 The elastic filament cool feeling fiber layers (elastic spunbonded nonwoven materials) are overlapped, as shown in figure 5, a Z-shaped cross overlapping structure is realized through cross lapping, a multi-layer overlapping fiber net with multidirectional elasticity is formed, and the number of lapping layers is 2-5.
The Z shape refers to the arrangement direction of the fiber length of the elastic filament cool feeling fiber layer in the multi-layer laminated fiber net, so that the multi-directional elasticity of the composite layer is realized due to the large number of the layer-laying layers.
With continued reference to fig. 8, a schematic cross-sectional view of the composite layer after compounding is shown.
The cross lapping is realized by a lapping machine.
Comparing fig. 9 with fig. 10, in which fig. 9 is a fiber orientation Distribution angle of an elastic filament cool feeling fiber layer (spunbond fiber), fig. 10 is a composite layer fiber orientation Distribution angle after being compounded, a horizontal axis is an angle (Fiber orientation angle), and a vertical axis is a Distribution condition (Distribution), in comparison, the composite layer obviously has fiber orientations of a plurality of angles, and has multidirectional elasticity.
S4 needling consolidation
Repeated perforation of the multilayer laminated web obtained in S3 is carried out in combination with the illustration of FIG. 6The needling density is 180-330 needling/cm 2 The needling depth is 4-12mm.
Specifically, the multi-layer laminated fiber web prepared in the step S3 is sent into a needling machine, and the skin-friendly elastic nonwoven bandage is prepared through the action of needles.
The needling frequency of the main needling machine is set to be 25Hz, and the needling depth is set to be 5mm.
Finally, the surface density of the obtained skin-friendly elastic nonwoven bandage is 325.99 g/m 2 。
Example 2:
the embodiment provides an application of an oriented elastic nonwoven material in manufacturing a skin-friendly elastic nonwoven bandage, which comprises the following specific manufacturing steps:
the difference between this example and example 1 is that the blend ratio of cellulose fiber and polyester fiber is 10:90.
An areal density of 141.30g/m was obtained in the same manner as in example 1 except that 2 Is a skin-friendly elastic nonwoven bandage.
Example 3:
the embodiment provides an application of an oriented elastic nonwoven material in manufacturing a skin-friendly elastic nonwoven bandage, which comprises the following specific manufacturing steps:
the example differs from example 1 in that the card feed rate is set at 5.30Hz.
An areal density of 193.79g/m was obtained in the same manner as in example 1 except that 2 Is a skin-friendly elastic nonwoven bandage.
Example 4:
the embodiment provides an application of an oriented elastic nonwoven material in manufacturing a skin-friendly elastic nonwoven bandage, which comprises the following specific manufacturing steps:
this example differs from example 1 in that the spunbond elastic nonwoven material used had an areal density of 120g/m 2 。
An areal density of 439.79g/m was obtained in the same manner as in example 1 except that 2 Is a skin-friendly elastic nonwoven bandage.
Example 5:
the embodiment provides an application of an oriented elastic nonwoven material in manufacturing a skin-friendly elastic nonwoven bandage, which comprises the following specific manufacturing steps:
the difference between the examples and example 1 is that the needling frequency of the main needling machine is set to 40Hz.
An areal density of 295.10g/m was obtained in the same manner as in example 1 except that 2 Is a skin-friendly elastic nonwoven bandage.
Example 6:
the embodiment provides an application of an oriented elastic nonwoven material in manufacturing a skin-friendly elastic nonwoven bandage, which comprises the following specific manufacturing steps:
the present embodiment differs from embodiment 1 in that the main needling machine is set to a needling depth of 9mm. An areal density of 324.12g/m was obtained in the same manner as in example 1 except that 2 Is a skin-friendly elastic nonwoven bandage.
To verify the preparation method and material properties in this scheme, performance tests were performed on the products in the examples, including areal density, thickness, cross-directional breaking strength, cross-directional breaking elongation, cross-directional elastic recovery, burst strength, and flexibility score.
The specific test method, test standard and test instrument are as follows:
1. areal density of
The testing method comprises the following steps: the test is carried out by using a small sample of 50cm 2 The disk sampler samples five samples were taken, the samples were tested on a balance and then averaged.
Test standard: GBT24218.1-2009 textile nonwoven test method part 1: measurement of mass per unit area.
2. Thickness of (L)
The testing method comprises the following steps: selecting 2500cm of area of the presser foot according to the test standard 2 The briquetting is selected to be 50cN. Finally, zeroing, starting testing, pressurizing for 30 seconds, sequentially testing 50 data, and averaging.
Test standard: GBT24218.2-2009 textile nonwoven test method part 2: and (5) measuring thickness.
Test instrument: digital fabric thickness gauge (YG 141D type, wenzhou great Rong textile instruments Co., ltd., china).
3. Test of longitudinal and transverse breaking strength and breaking elongation
The testing method comprises the following steps: the national standard prescribes that the specification of the sample is 200mm long, 50mm wide and the clamping distance is 200mm. In the experiment, 5 samples are adopted in the longitudinal and transverse directions, the specification of each sample is 200mm long and 50mm wide, the clamping distance is 100mm, the stretching speed is 100mm/min, and the average value is calculated.
Test standard: GBT24218.3-2010 textile nonwoven test method part 3: determination of breaking Strength and elongation at break.
Test instrument: nonwoven constant temperature mechanical property analyzer (HD 026S type, nantong macro laboratory instruments Co., ltd., china).
4. Elastic recovery in the machine and transverse directions
The testing method comprises the following steps: in the experiment, 5 samples are adopted in the longitudinal and transverse directions, the specification of the samples is 200mm long and 50mm wide, the clamping distance is 100mm, the stretching speed is 100mm/min, the return speed is 50mm/min, the pre-tension is 1N, the elongation is 50%, the retention time is 30s, the dead time is 60s, and the repeated stretching is carried out for two times.
Test standard: since no nonwoven elastic criteria were found, the test was conducted according to the tensile elastic recovery test criteria for knitted fabrics: method for testing tensile elastic recovery rate of FZ/T70006-2004 knitted fabric.
Test instrument: nonwoven constant temperature mechanical property analyzer (HD 026S type, nantong macro laboratory instruments Co., ltd., china).
5. Bursting strength
Test conditions: 100mm of 2 The head end of the ejector rod is a polishing steel ball, the diameter of the ball is 25mm, and the bursting speed is 300mm/min. Each sample was tested in 5 groups and averaged.
Test standard: GB/T19976-2005 (Steel ball method for measuring burst strength of textiles).
Test instrument: YG065H fabric electronic strength instrument (YG 065H, electronic instruments Inc., lystate, china).
6. Flexible score
Test conditions:
with an area of 100cm 2 The disk sampler of (2) was used to collect 5 samples, and the samples were placed in a constant temperature and humidity box to be conditioned for 24 hours. All weights were removed during the test, and the softness test was performed on the samples without pressure, and the results averaged.
Test standard: AATCC TM202.
Test instrument: pharbometeer fabric style instrument (FES-3-10 type, shanghai, inc., of the commercial trade Co., ltd.).
The final test results are shown in figure 2.
In the process test, based on the test of the density after needling, referring to fig. 11, the non-needled material has a significant difference in the density (mass per unit area) before and after needling (needle punching), and the density after needling is much greater than that before needling, and can be maintained at 320 g/m 2 And fluctuates left and right.
The principle of unidirectional elasticity test is shown in fig. 12 and 13, fig. 12 is an MD elastic principle diagram (machine direction), fig. 13 is a CD elastic principle diagram (transverse coordinate direction), the elastic recovery is shown in fig. 14, the horizontal axis is a sample, the vertical axis is the elastic recovery, and the elastic recovery in both the transverse and longitudinal directions fluctuates by about 50%.
With continued reference to fig. 15-17, longitudinal fracture test data is provided.
Referring to fig. 15, a longitudinal tensile breaking curve is shown, the vertical axis is a load (unit N), the horizontal axis is a deformation, the breaking load is greater than 250N, continuing to refer to fig. 16, a longitudinal tensile breaking strength and a slip strength are shown, the vertical axis is a breaking force and a slip strength (force at break), the horizontal axis is a sample, the longitudinal tensile breaking strength is greater than 250N, and referring to fig. 17, the longitudinal breaking elongation and the slip elongation are shown, the horizontal axis is a sample, and the longitudinal breaking elongation can be about 100%.
18-20, are transverse rupture test data.
Referring to fig. 18, a transverse tensile fracture curve is shown, the vertical axis shows a load (unit N), the horizontal axis shows a deformation, the fracture load is greater than 125N, continuing to refer to fig. 19, the vertical axis shows a transverse tensile fracture strength and a slip strength, the horizontal axis shows a sample, the transverse tensile fracture strength is greater than 125N, and referring to fig. 20, the transverse tensile fracture elongation and the slip elongation show a vertical axis fracture elongation and a slip elongation show Elongation at rupture, the horizontal axis shows a sample, and the transverse tensile fracture elongation shows about 130%.
The thickness and the porosity were tested, referring to fig. 21, the vertical axis is the thickness and the porosity, the horizontal axis is the sample, the thickness is about 1.5mm, the porosity is more than 80%, the air permeability is better, and the air flow rate can reach 0.4m/s in the air permeability model.
Softness was measured as shown in fig. 22, softness score is a sample on the horizontal axis, softness score is a sample on the vertical axis, and the result shows that softness score is higher than 90, and cool feeling was measured, and Q-max (heat transfer peak) is higher than 0.15 as shown in fig. 23, and when Q-max value is higher than 0.15, the material is regarded as having cool feeling effect.
Analysis was performed on the process test and example test results to reach the following conclusion: the directional elastic nonwoven material prepared by the method fully utilizes the elasticity of the elastic filament cool feeling fiber layer (elastic spunbonded nonwoven material).
Meanwhile, when the elastic filament cool feeling fiber layer (elastic spunbonded nonwoven material) prepared by the application is used as a bandage, the Z-shaped cross lamination structure of the elastic filament cool feeling fiber layer ensures uniform elasticity; its cellulose fiber host structure and physical entanglement morphology imparts its excellent flexibility, which is known to score greater than 92 by the Pharbometer test method (AATCC TM 202).
In summary, the directional elastic nonwoven material prepared by the scheme is an integrated structure with flexibility, elasticity and cool feeling, can meet the technical requirements of application in the fields of medical bandages, medical auxiliary materials and the like, achieves the purposes of promoting wound healing and characteristic treatment, has a wider application range and is easy to use.
24-27, a dressing application using the skin-friendly elastic nonwoven bandage disclosed in the application is provided, and after the dressing is finished, gesture free change can be performed to further verify the performance effect of the material.
The foregoing embodiments are merely illustrative of the technical concept and features of the present invention, and are not intended to limit the scope of the present invention in any way, as long as they are known to those skilled in the art and can be implemented according to the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of protection of the present invention.
In the description of the present embodiment, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements.
The specific meaning of the above terms in the present scheme will be understood in a specific case by those of ordinary skill in the art.
It should be understood that the above-described embodiments are exemplary only and not limiting, and that various obvious or equivalent modifications and substitutions to the details described above may be made by those skilled in the art without departing from the underlying principles of the present disclosure, and are intended to be included within the scope of the claims.
Claims (5)
1. An oriented elastic nonwoven material comprising: the method comprises the steps of overlapping and combining an elastic filament cool feeling fiber layer with the mass ratio of 50% -75% and a short fiber skin softening layer with the mass ratio of 25% -50%, and carrying out needling consolidation to obtain an oriented elastic non-woven material, wherein the oriented elastic non-woven material has oriented elasticity, and the oriented direction is any direction with an included angle of 25 ° -75 ° with the machine direction;
the elastic recovery rate of the directional elasticity is 30% -70%;the surface density is 100-550g/m 2 The thickness is 0.6-2.5mm, the porosity is 90-99.5%, and the contact cool feeling coefficient is 0.170-0.450J/cm.s;
the method for preparing the oriented elastic nonwoven material comprises the following steps:
the preparation method comprises the steps of manufacturing an elastic filament cool feeling fiber layer, wherein the preparation raw materials comprise polypropylene polymer and functional polymer, and the preparation is carried out by adopting a spunbond process; the preparation raw materials comprise the following components in percentage by mass:
PP：15.5%-50.5%；
EVOH：3%-10%；
POE：45%-70%；
paraffin oil: 1.5% -4.5%;
the melt index of the EVOH is 12-35g/10min at the temperature of 210 ℃ and the pressure of 2.16 and kg, the weight average molecular weight of the PP is 18000-35000, and the melt index of the EVOH is 35-60g/10min at the temperature of 210 ℃ and the pressure of 2.16 and kg;
the method comprises the steps of manufacturing a short fiber skin softening layer, and preparing polyester fibers and cellulose fibers into the short fiber skin softening layer through a carding process;
the elastic filament cool feeling fiber layer and the short fiber soft skin layer are made into a multi-layer superposed fiber net through cross lapping;
needling and consolidation; in the needling consolidation step, the multi-layer laminated fiber web is repeatedly punctured by adopting a needling process, and the needling density is 180-330 needling/cm 2 The needling depth is 4-12mm;
the included angle between the fiber length direction of the elastic filament cool feeling fiber layer and the machine direction is less than 15 degrees, and the fiber ratio is more than 85 percent; the fiber ratio of the included angle between the fiber length direction of the short fiber skin softening layer and the machine direction is less than 25 degrees and is more than 90 percent;
in the step of manufacturing the composite layer, the elastic filament cool feeling fiber layer and the short fiber softening layer are vertically laminated, and the laminated layers are sent into a lapping machine for overlapping lapping to form a multi-layer overlapped fiber net, wherein the number of lapping layers is 2-5.
2. The oriented elastic nonwoven material of claim 1, wherein the staple fiber skin layer comprises:
mixing according to the mass ratio:
10% -50% of cellulose fiber;
50% -90% of polyester fiber;
the cellulose fiber is viscose fiber.
3. The oriented elastic nonwoven material of claim 2 wherein said layer of elastic filament cool feeling fibers comprises polyolefin elastic fibers having a fiber fineness of 1.6 to 2.2D;
the short fiber skin softening layer comprises 30-100% of cellulose fibers and 0-70% of polyester fibers in mass ratio; the fineness of the cellulose fiber is 0.99-1.51dtex, and the length of the fiber is 38-61mm; the fiber fineness of the polyester fiber is 2.2-5.6dtex, and the fiber length is 38-61mm.
4. The oriented elastic nonwoven material of claim 3, wherein the cross-directional breaking strength is > 79N and the cross-directional elongation at break is greater than 124%; the longitudinal breaking strength is more than 157N, and the longitudinal breaking elongation is more than 74%; burst strength > 214N; the flexibility score is more than or equal to 92.
5. An elastic article characterized by the use of the oriented elastic nonwoven material of any one of claims 1-4.
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| CN1026140C (en) * | 1992-07-31 | 1994-10-05 | 周征彦 | Nonwoven fabric and its producting process and apparatus |
| JP4233435B2 (en) * | 2003-11-20 | 2009-03-04 | 花王株式会社 | Composite sheet |
| CN1981078A (en) * | 2004-07-02 | 2007-06-13 | 可乐丽股份有限公司 | Fabric and clothes for atopic dermatitis patients |
| WO2007127442A2 (en) * | 2006-04-27 | 2007-11-08 | Invista Technologies S.A R.L. | Anisotropic extensible nonwovens |
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| CN101230519B (en) * | 2007-12-21 | 2011-04-27 | 东华大学 | Spun-laced compound nonwoven material containing line elastomer, preparation method and equipment thereof |
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| CN113430716A (en) * | 2021-03-31 | 2021-09-24 | 苏州多瑈新材料科技有限公司 | Structural elastic non-woven composite material and preparation method thereof |
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